Speaker Surface Diffuser Balancing Audible and Inaudible Sound
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Solution Overview
Problem
Existing technologies lack a method to effectively diffuse and improve the directional characteristics of inaudible range sounds output from speakers, particularly with the rise of high resolution audio systems that utilize both audible and inaudible range sounds.
Innovation Solution
A speaker device incorporating a diffusion member on its sound emission surface that propagates both audible and inaudible range sounds, utilizing a member with specific airflow resistance values and structures to enhance the diffusion of inaudible range sounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an acoustic lens is used to diffuse audible range sound, then the audible range sound diffusion is improved, but no effect is achieved on inaudible range sound diffusion
Solution Approach 1:
The patent changes the physical parameters of the diffusion member by specifying particular airflow resistance values (0.0020 to 0.0090 kPa·s/m) to enable effective diffusion of inaudible range sound while maintaining audible range sound diffusion capability. This parameter optimization allows the same structure to handle both frequency ranges effectively.
Solution Approach 2:
The diffusion member is designed to perform multiple functions simultaneously: it diffuses both audible range sound and inaudible range sound. This multi-functional design resolves the contradiction by making a single component effective across different sound frequency ranges rather than requiring separate solutions for each range.
2Ease of operation
If a diffusion member with high airflow resistance is used, then inaudible range sound diffusion is improved, but audible range sound propagation is hindered
Solution Approach 1:
The patent identifies and optimizes the airflow resistance parameter to a specific range (0.0020 to 0.0090 kPa·s/m) that balances the competing requirements. This parameter change enables the diffusion member to effectively diffuse inaudible range sound without creating excessive resistance that would hinder audible range sound propagation.
3Ease of manufacture
If the diffusion member structure is simplified, then manufacturing cost is reduced, but diffusion effectiveness of inaudible range sound decreases
Solution Approach 1:
The patent employs porous materials with specifically controlled airflow resistance characteristics to achieve inaudible range sound diffusion. This approach provides an effective diffusion mechanism without requiring complex structured components, thus maintaining ease of manufacture while achieving the desired diffusion effectiveness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The diffusion member effectively diffuses inaudible range sounds, improving their directional characteristics and ensuring a subtraction value of sound pressure of -16 dB or less, thereby enhancing the listening experience.
Implementation Method 1
the diffusion member is a member that propagates the audible range sound and the inaudible range sound inside
Data Source
Figure 1
AI summary
[Task] To provide a speaker device capable of diffusing an inaudible range sound output from a speaker and improving directional characteristics of the inaudible range sound. [Solution] Provided is a speaker device including a speaker that outputs an audible range sound and an inaudible range sound, and a diffusion member that is provided on a sound emission surface of the speaker and diffuses the inaudible range sound output from the speaker, in which the diffusion member is a member that propagates the audible range sound and the inaudible range sound inside.